<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        
// //实现以下效果
// const counter = createCounter(5);
// console.log(counter()); // 6
// console.log(counter()); // 7
// console.log(counter()); // 8
// console.log(counter(10)); // 11
// console.log(counter()); // 12
const createCounter=a=>{
    const accumulate=b=>{
       a=b||a
        a++
        console.log(a);
    }
    return accumulate
}
const counter = createCounter(5);
counter()
counter()
counter()
counter(10)
counter()
    </script>
</body>
</html>